To jam and learn 古井戸 - (LIVE Ver.) ポスターカラー chords, your primary focus should be mastering these chords sequence: Bm, A, Bm, A, D, Em, A, G, F#, D, Em and D. To build a solid grasp, start slowly at 36 BPM and then match the original tempo of 73 BPM. Given the song's key of G Major, adjust the capo to align with your vocal range and chord preference.